Improvement in paper-cutting machines



J. P. DUNWALIL PAPER-CUTTING MACHINE.

Patented June 20 18.76.

WWII f l I WITNESSES N.PE|'ERS. PHOTOLITHOGHAFNER, WASNING'ION. D. C.

UNITED STATES PATEN A OFFICE,

JOHN P. DUNWALD, OF NEW YORK, N.

IMPROVEMENT IN PAPER CUTTlNG MACHINES.

Specification forming part of Letters Patent No. 178,915; dated J une 20, 1876; application filed April 10, ,1876.

To all'whom it may concern:

- Be it known-that I, JOHN P. DUNWALD, of the city, county, and State of New York, have invented anew and improved Paper-Cutting Machine, of which the following is a specification:

In the accompanying drawing, Figure 1 represents a side elevation of my improved paper-cuttin g machine; Fig. 2, a top view; Fig.

cutting machine of considerable power, and

of convenient adjustment and operation; and it consists, mainly, of the combination of the swinging and balanced cutting-knife with the clamping mechanism of an adjustable cuttinggage and of a sliding feed or set'gage of special construction.

In the drawing, A represents the "supporting-frame of my improved paper-cutting machine, whichis provided, in the customary manner, with a stationary knife, B, and a swinging knife, 0. A vertically-sliding clampframe, 1), with lateral leather-facedtop bar, is raised bythe action of the swinging knife 0, or a curved arm, 0, that is pivoted to the side of frame A, and connected by its lower downward-extending arm, with a pivot-link, a, to the middle part of the lower cross-bar of the clamping-frame D. The weighted rear arm of the swinging cutting-knife 0 runs by 'means of a friction-roller, b, along the curved arm 0, so as to bear on the same and raise the clamping-frame, when the knife is carried in upward direction, while releasing the arm 0, when the knife is brought down for cutting, so that the clamping-frame byits own weight is applied to the paper to retain the same firmly in thick or thin layers for the action of the knife.

The pressure of the clamping-frame on the friction-roller of the cutting-knife holds the knife in inclined position ready for convenient use without requiring the entire throwing up of the knife, as heretofore.

The clamping-frame may be retained in raised position by a bottom piece, d, that engages a lug, d, or the lower cross-bar of the frame, in which case the knife swings free of the action of the clamping-frame.

The width of the paper to be cut is regulated by means of an adjustable gage, E, which is arranged in suitable standardsE in front of the knives, and carried to or from the same along guide-slot and rod of a table, below the feed-table, by means of a wire rope, j, that is wound on a drum or roller, f, and attached to the front and rear ends of the standards or frame, to be carried, by the turning of the drum in either direction, nearer or closer to the knives, as required. When the gage-piece is at the position required it is clamped by av lateralcam-shaft and clamp-piece to a guiderod under the table, to be retained in rigid position forthe gaging of the paper. When a larger width for the paper to be cutoff is required than that admitted by the gage-piece E, the same may be swung back on the standards by releasing a lock-spring, g. The paper is set to the knives on the upper table by means of a gage, F, that is guided along central slot and bottom rod F and along a sid piece, F set by pins into the table.

The lateral gage-piece F is secured by a setscrew, h, and pin h, to a sliding plate, F

(shown in Fig. 5,) and adjusted to run exactly at the angle of ninety degrees to the fixed side guide F by a rear slot and set-screw, i, of the set-plate F The gage F may be securedin fixed position by a lateral cam-shaft, l, and friction-plate l, clampedto the guiderod F in similar manner as gage E, as shown in detail in Fig. 4.

The upper feed or set gage F may be detached entirely, as well as the side guide-piece,

when the same is not required, or when the the paper is to be cut at different angles.

' Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in a paper-cutting ma chine, of the curved pivoted arm 0 and the swinging and balanced cutting-knife U,havin g a friction-roller, b, with the vertically-sliding paper-clam pin g frame D and link a, as and for the purpose set forth. I

2. The combination of the swinging cut-0E 2 mama gage with a lock-spring at the side standard,v 4. The combination of a lateral gage-piece, to be releasedlfor use of widerfgage, as; sbeci F, clamp-screw h, amlpimht, with-the sliding fied. set-plate F having rear slot and clamp-screw,

3. In paper-cutting machines, the combinaas and for the purpose set forth.

tion of a sliding and adjustable gage-piece," JOHN P. DUN WALD.

guided centrally and at the side with a set- Witnesses:

plate and clamping mechanism appliedic 33 PAULGOEPEL,

guide-rod, substantially as specified. ALEX. F. ROBERTS. 

